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Finding the Fourth Proportional to 994.10, 1,372.48 and 640.18

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Solution

The fourth proportional to 994.10, 1,372.48 and 640.18 is: 883.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.10 : 1,372.48 = 640.18 : x
  2. Step 2: Convert to fraction form
    994.10/1,372.48 = 640.18/x
  3. Step 3: Cross multiply
    994.10x = 1,372.48 × 640.18
  4. Step 4: Simplify right side
    994.10x = 878,634.25
  5. Step 5: Solve for x
    x = 878,634.25/994.10
  6. Step 6: Final answer
    x = 883.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.